<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
		<script>
		function login(){
			var b=document.getElementById("ll");
			var a=document.getElementById("cc");
			var c=document.getElementById("tt");
			if(b.value!=""&&a.value!=""&&c.value!=""){
			document.getElementById('imsg').style.display='block';
		}}
		</script>
		<input id="ll">
		<input id="cc">
		<input id="tt">
		This is 
		<div id="imsg" style="display: none;">hello world!</div>
		<button onclick="login()" valus="as"></button>
	</body>
</html>
